On-line routing of real-time messages

Joseph Y.T. Leung, Tommy W. Tam, Gilbert H. Young

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Scopus citations

Abstract

The problem of routing unit-length, real-time messages in a distributed system is considered. An on-line routing algorithm is a distributed algorithm that routes messages without any knowledge of future arrivals of messages. An on-line algorithm is optimal if it produces a feasible routing whenever one exists. In this paper we study the issue of whether it is possible to have an optimal on-line algorithm for the following networks-unidirectional ring, out-tree, in-tree, bidirectional tree and bidirectional ring. The problem is considered under various restrictions of the four parameters-origin node, destination node, release time and deadline. For unidirectional ring, it is shown that no such algorithm can exist unless one of the four parameters is fixed. For out-tree, we show that no such algorithm can exist unless one of the following three parameters-origin node, destination node and release time-is fixed. For in-tree, we show that no such algorithm can exist unless one of the following three parameters-origin node, destination node and deadline-is fixed. For bidirectional tree, it is shown that no such algorithm can exist unless either the origin node or the destination node is fixed. Finally, for bidirectional ring, we show that no such algorithm can exist unless the origin node and either the destination node or the release time are fixed.

Original languageEnglish (US)
Title of host publication1990 Proceedings 11th Real-Time Systems Symposium, RTSS 1990
Pages126-135
Number of pages10
DOIs
StatePublished - 1990
Event1990 11th Real-Time Systems Symposium, RTSS 1990 - Lake Buena Vista, FL, United States
Duration: Dec 5 1990Dec 7 1990

Publication series

NameProceedings - Real-Time Systems Symposium
ISSN (Print)1052-8725

Other

Other1990 11th Real-Time Systems Symposium, RTSS 1990
CountryUnited States
CityLake Buena Vista, FL
Period12/5/9012/7/90

All Science Journal Classification (ASJC) codes

  • Software
  • Hardware and Architecture
  • Computer Networks and Communications

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